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diff --git a/js/src/builtin/streams/ReadableStreamInternals.h b/js/src/builtin/streams/ReadableStreamInternals.h
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+++ b/js/src/builtin/streams/ReadableStreamInternals.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* The interface between readable streams and controllers. */
+
+#ifndef builtin_streams_ReadableStreamInternals_h
+#define builtin_streams_ReadableStreamInternals_h
+
+#include "mozilla/Attributes.h"  // MOZ_MUST_USE
+
+#include "jstypes.h"                               // JS_PUBLIC_API
+#include "builtin/streams/ReadableStreamReader.h"  // js::ForAuthorCodeBool
+#include "js/RootingAPI.h"                         // JS::Handle
+#include "js/Value.h"                              // JS::Value
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSObject;
+
+namespace js {
+
+class PlainObject;
+class PromiseObject;
+class ReadableStream;
+
+extern MOZ_MUST_USE PromiseObject* ReadableStreamAddReadOrReadIntoRequest(
+    JSContext* cx, JS::Handle<ReadableStream*> unwrappedStream);
+
+extern MOZ_MUST_USE JSObject* ReadableStreamCancel(
+    JSContext* cx, JS::Handle<ReadableStream*> unwrappedStream,
+    JS::Handle<JS::Value> reason);
+
+extern MOZ_MUST_USE bool ReadableStreamCloseInternal(
+    JSContext* cx, JS::Handle<ReadableStream*> unwrappedStream);
+
+extern MOZ_MUST_USE PlainObject* ReadableStreamCreateReadResult(
+    JSContext* cx, JS::Handle<JS::Value> value, bool done,
+    ForAuthorCodeBool forAuthorCode);
+
+extern MOZ_MUST_USE bool ReadableStreamErrorInternal(
+    JSContext* cx, JS::Handle<ReadableStream*> unwrappedStream,
+    JS::Handle<JS::Value> e);
+
+extern MOZ_MUST_USE bool ReadableStreamFulfillReadOrReadIntoRequest(
+    JSContext* cx, JS::Handle<ReadableStream*> unwrappedStream,
+    JS::Handle<JS::Value> chunk, bool done);
+
+extern uint32_t ReadableStreamGetNumReadRequests(ReadableStream* stream);
+
+extern MOZ_MUST_USE bool ReadableStreamHasDefaultReader(
+    JSContext* cx, JS::Handle<ReadableStream*> unwrappedStream, bool* result);
+
+}  // namespace js
+
+#endif  // builtin_streams_ReadableStreamInternals_h